My Dribbble content still reflects my design style to a certain degree - with things like icons, logos and illustration, it's a bit easier. However, with a 400x300 (yes, I'm aware that there are @2x pixel and file attachment but when people browse, they only see the small cropped thumbnails) pixel restriction, it's not always easy to fit a meaningful UI design there and still keeping the thumbnail attractive (so you can get more clicks - this isn't just for an ego boost, we need to market ourselves too).

When a potential client contacts me on Dribbble, I usually send them samples of my "real" work so they can get a better idea of what they will be getting from me.

I used Forrst for a while, and some people posted design processes there. However, people are naturally drawn to eye candies more. Like others have mentioned, Behance is another option.